Fellowes Designer Suites Laptop Riser places your laptop at a comfortable viewing position to prevent neck strain associated with extensive computer use. Height adjustable with four positions from 88mm to 184mm and angle adjustable between 0 and 30 degrees, leaving you free to customise your sitting and viewing position for maximum comfort. The stabilising edge ensures the safety and security of your laptop whilst in use while the cooling vents prevent overheating.height adjustable with four positions 88mm-184mm, angle adjustable between 0-30 degrees, stabilising front edge prevents laptop from sliding off the unit, cooling vents help dissipate laptop heat